added 260907 version of worker toolkit

worker-toolkit-flaredown/repo/frontend/app/mixins/history-trackable.js

@@ -0,0 +1,24 @@
+import Ember from 'ember';
+
+const {
+  get,
+  Mixin,
+  inject: {
+    service,
+  },
+} = Ember;
+
+export default Mixin.create({
+  routeHistory: service(),
+
+  afterModel(model, transition) {
+    get(this, 'routeHistory').pushEntry(this.historyEntry(model, transition));
+  },
+
+  historyEntry(model, transition) {
+    // Redefine this method in every route this mixin included to if it relies on params
+    // It should return an array of route name and params
+    // return null if the route should be skipped from adding to history
+    return [transition.targetName];
+  },
+});